Follow instructions in the owner's manual.
Your colt huntsman was made by colt in 1967.
Yes.
Go to the website below and click on Colt Huntsman Pistol. It will give you the procedure for caring & cleaning. http://stevespages.com/page7b.htm
Yes.
about 1960
1968
Proofhouse.com has Colt sn data
It was made in 1960.
Made in 1964.
If it is 079436S, then around 1975 or so.
50-550 usd
@1956